Atmel's ATA6843 and ATA6844 are three-phase brushless DC motor (BLDC) controllers that integrate a microcontroller and six discrete power MOSFETs and offer a 3.3V/5V linear regulator and window watchdog for the car The application provides a complete BLDC motor control singleton. The operating voltage is 5.25V to 32V, and the operating junction temperature is 150 degrees C. It can directly drive 6 external NMOS transistors with a maximum switching frequency of 50kHz. This article describes the main features of the ATA6843 and ATA6844, block diagrams and typical application circuits and a list of external components used.
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BLDC Motor Driver and LIN System Basis Chip
The Atmel® ATA6843 and Atmel ATA6844 are system basis chips for three-phase brushless DC motor controllers designed in Atmel's state-of-the-art 0.8μm SOI technology SMART-ISTM1. In combination with a microcontroller and six discrete power MOSFETs, The system basis chip forms a BLDC motor control unit for automotive applications. In addition, the circuits provide a 3.3V/5V linear regulator and a window watchdog.
The circuit includes various control and protection functions like overvoltage and overtemperature protection, short circuit detection, and undervoltage management. Thanks to these function blocks, the driver fulfils a maximum of safety requirements and offers a high integration level to save cost and space in various applications The target applications are most suitable for the automotive market due to the robust technology and the high qualification level. Atmel ATA6844, in particular, is designed for applications in a high-temperature environment.
Main features of ATA6843 and ATA6844:
• Broad Operation Voltage Range from 5.25V to 32V
• Atmel ATA6843 Temperature Range TJ = 150°C
• Atmel ATA6844 Extended Temperature Range TJ = 200°C
• Direct Driving of 6 External NMOS Transistors with a Maximum Switching Frequency of 50kHz
• Integrated Charge Pump to Provide Gate Voltages for High-side Drivers and to Supply the Gate of the External Battery Reverse Protection NMOS
• Built-in 5V/3.3V Voltage Regulator with Current Limitation
• Reset Signal for the Microcontroller
• Sleep Mode with Supply Current of typically < 45μA
• Wake-up via LIN Bus or High Voltage Input
• Programmable Window Watchdog
• Battery Overvoltage Protection and Battery Undervoltage Management
• Overtemperature Warning and Protection (Shutdown)
• Jump Start Compatible
• 200mA Peak Current for Each Output Driver
• LIN Transceiver Conformal to LIN 2.1 and SAEJ2602-2 with Outstanding EMC and ESD Performance
• QFN48 Package 7mmxï€ 7mm
figure 1. ATA6843 and ATA6844 block diagram
figure 2. Typical application circuit diagram of ATA6843 and ATA6844
External component table in application circuit
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